condition mean min max ZT0-3 37.106216 37.106216 37.106216 ZT4-7 48.611527 48.611527 48.611527 ZT8-11 81.9576605 81.9576605 81.9576605 ZT12-15 55.6867875 55.6867875 55.6867875 ZT16-19 37.806588500000004 37.806588500000004 37.806588500000004 ZT20-23 37.625904500000004 37.625904500000004 37.625904500000004